package com.jiandp.utils;

import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {
    /**
     * 开始时间戳
     */
    private static final long BEGIN_TIMESTAMP =    1735689600L;
    private  static  final int COUNT_BITS = 32;

    private StringRedisTemplate stringRedisTemplate;
    public RedisIdWorker(StringRedisTemplate stringRedisTemplate){
        this.stringRedisTemplate=stringRedisTemplate;
    }

    public  long nextId(String keyPrefix){
        //1.生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long nowSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = nowSecond-BEGIN_TIMESTAMP;

        //2.生成序列号
        //2.1 获取当前时间，精确到天
        String date  =now.format(DateTimeFormatter.ofPattern("yyyy:MM::dd"));
        //2.2自增长
        long count=stringRedisTemplate.opsForValue().increment("icr:"+keyPrefix+":"+date);


        //拼接并返回
        return timestamp << COUNT_BITS | count;

    }

}
